“…Harrison & Liska, 1994;Kleinginna & Kleinginna, 198 1 ;Klinger, Barta, & Maxeiner, 1981;Miller, 1985;Roberts, 1992). Therefore, to achieve a more complete understanding of motivation, it is necessary to deal with several different factors (Granlund, Sojka, & Johansson, 1988;Klinger et al, 1981;Roberts, 1992).…”